Microchip Technology Inc. introduced the MCP990X family of System Management Bus (SMBus) temp sensor ICs for monitoring of up to four channels in cold, outdoor and industrial low-temperature applications ranging from freezers and refrigerators to base stations and remote radio units. With ±1°C maximum accuracy for both external and internal diode temperatures from -40°C to +65°C, these ICs provide a low-cost, highly flexible solution where precision is needed at lower temperatures.
Advanced features of the MCP990X family include remote diode temperature measurement with resistance error correction that compensates for voltage drops from connectors and long board traces, enabling accurate readings of up to 20 inches away from the IC. Injected system noise from components such as DC-DC converters and backlight inverters is also minimized with a sample-frequency hopping filter, allowing for easier placement and routing. The combination of these features with options for dual, triple and quad temperature monitoring provides for a wider range of measurement opportunities for an entire system with a single IC.
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